Derivatives of 2-pyrrolidone-5-carboxylic acid and method of obtaining
them
    5.
    发明授权
    Derivatives of 2-pyrrolidone-5-carboxylic acid and method of obtaining them 失效
    2-吡咯烷酮-5-羧酸的衍生物及其获得方法

    公开(公告)号:US4952706A

    公开(公告)日:1990-08-28

    申请号:US417089

    申请日:1989-10-04

    IPC分类号: C07D207/28

    CPC分类号: C07D207/28

    摘要: The new, crystalline trihydrates of sodium L- and D-2-pyrrolidone-5-carboxylate. These trihydrates can be obtained by adjusting the concentration and the temperature in an aqueous solution of sodium L- or D-2-pyrrolidone-5-carboxlate in such a manner that the solubility of the desired trihydrate is exceeded.

    摘要翻译: L-和D-2-吡咯烷酮-5-羧酸钠的新的结晶三水合物。 这些三水合物可以通过调节L型或D-2-吡咯烷酮-5-甲酸钠水溶液的浓度和温度,从而超过所需三水合物的溶解度。

    Method of preparing alkali metal salts of 2-pyrrolidone-5-carboxylic acid
    7.
    发明授权
    Method of preparing alkali metal salts of 2-pyrrolidone-5-carboxylic acid 失效
    制备2-吡咯烷酮-5-羧酸的碱金属盐的方法

    公开(公告)号:US4946968A

    公开(公告)日:1990-08-07

    申请号:US258740

    申请日:1988-10-17

    IPC分类号: C07D207/28

    CPC分类号: C07D207/28

    摘要: Alkali metal salts of 2-pyrrolidone-5-carboxylic acid (pyroglutamic acid) are prepared by heating the corresponding alkali metal salt of glutamic acid to a temperature between its melting point and 270.degree. C. until the water liberated by the intramolecular condensation (cyclocondensation) has been completely eliminated.

    摘要翻译: 通过将相应的谷氨酸的碱金属盐加热至270℃的温度,直至通过分子内缩合释放的水(环化缩合)制备2-吡咯烷酮-5-羧酸(焦谷氨酸)的碱金属盐 )已经完全消除。